<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	</body>
	<script>
		(function(){
			//var a;
			//var a = 0;
			//var a = null;
			//var a = [];
//			var a = {};
//			if(a){
//				alert("a")
//			}

			var a;
			console.log(a)
		})();
	</script>
</html>
